The OSG NPT Spiral Point Threading Tap is built for through-hole tapping of 3/8-18 NPT threads, delivering fast, precise results for plumbing, hydraulic, and pneumatic components. With a robust HSS‑E cobalt core and a Steam Oxide finish, it stands up to repeated use in challenging materials while maintaining accurate threads.

• Size / Thread: 3/8-18 NPT through-hole threading tap designed for efficient, reliable pipe-thread production.
• Material: HSS‑E (high-speed steel with cobalt) for enhanced hardness and heat resistance during demanding tapping tasks.
• Coating: Steam Oxide coating to improve wear resistance and lubricity, extending tool life in production environments.
• Geometry: Spiral point design promotes immediate chip evacuation, reducing face and flank rubbing in through-holes.
• Through-Hole Suitability: Specifically optimized for through-hole tapping to yield clean, consistent threads in a single pass.
• Precision & Durability: OSG engineering delivers tight tolerances and long tool life for reliable, repeatable results.

This tap is ideal for manufacturers and shop floors that demand durable performance in through-hole NPT threading. The combination of HSS‑E cobalt and Steam Oxide coating reduces wear under high cutting temperatures, helping maintain thread accuracy across batches. The spiral point geometry accelerates chip clearance, minimizing tool chatter and downtime, so you can complete more parts with fewer tool changes. Whether outfitting hydraulic manifolds, pneumatic fittings, or pipe assemblies, this tap provides dependable, repeatable threads that meet standard NPT specifications.